feat: add tooltip primitive usage on PredictionCard icon buttons (Closes #823)

[waterWang]

Description

Adds tooltip primitives to the PredictionCard component's icon buttons for better UX.

Changes

• components/PredictionCard.tsx: Wrapped status icon, OutcomeIcon, and odds trigger with the Tooltip component from @/app/components/Tooltip
  • Status icon now shows descriptive tooltip (e.g., "This prediction is currently active")
  • OutcomeIcon shows tooltip explaining the shape-based status indicator
  • Odds trigger shows expand/collapse tooltip text that updates dynamically
• components/tests/PredictionCard.test.tsx: Added 5 tooltip-specific tests covering:
  • Tooltip appears on hover for status icon
  • Correct tooltip content for each status variant (won, lost, pending, active)
  • Odds expand/collapse tooltip on hover
  • Tooltip content updates after expanding odds
  • Tooltip is hidden by default (no hover state)

Testing

All existing tests pass. New tooltip tests verify the hover behavior using @testing-library/user-event.

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